[class.inhctor.init] Add missing closing paren from P0136R1.

Author: zygoloid

source/special.tex

@@ -2033,7 +2033,7 @@
 \pnum
 When a constructor for type \tcode{B} is invoked
 to initialize an object of a different type \tcode{D}
-(that is, when the constructor was inherited~(\ref{namespace.udecl}),
+(that is, when the constructor was inherited~(\ref{namespace.udecl})),
 initialization proceeds as if a defaulted default constructor
 were used to initialize the \tcode{D} object and
 each base class subobject from which the constructor was inherited,